Add warm water to the bowl of a stand mixer. Add 1 egg, butter pieces, and honey. Add flour, buttermilk powder, and gluten. Add salt to the side of the bowl. Make a well in the center of the dry ingredients and add the yeast to the well. Fit mixer with a dough hook and mix on speed 1 or 2 for 5 minutes or until a dough ball forms and cleans the sides of the bowl. Dough ball should be tacky but not sticky, and should spring back when lightly touched with a finger. If dough is too sticky, add flour, one tablespoon at a time. If dough is too dry, add water, 1 teaspoon at a time.